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Comment: Re:umm duh? (Score 1) 154

by TheRaven64 (#47529479) Attached to: Dropbox Head Responds To Snowden Claims About Privacy
The anonymous poster pointed out a simpler mechanism, which is used in practice on file stores that want to be encrypted on the server. This technique also has a number of advantages. Using a symmetric cypher is generally faster than an asymmetric one and using a different key for each file is just good practice anyway as it limits the damage that certain kinds of trojan can do. If you're sharing with everyone, then you may as well just give the server the AES key and ask it to decrypt the file. If you're sharing with just a few people, then sending them a (fixed-size) key for each file is not too much overhead.

Comment: Re:Astronomy, and general poor night-time results. (Score 1) 469

by TheRaven64 (#47529469) Attached to: Laser Eye Surgery, Revisited 10 Years Later
The thing that's really put me off the surgery is the improvement in contact lens technology over the last 10 years. My sight is sufficiently bad in one eye that I'd have to have an implanted contact lens, although the other could be fixed by burning the cornea. The contact lenses that I have now; however, are so thin that I don't notice that I'm wearing them most of the time and can be worn overnight. I put them in at the start of a month and then change them a month later. There's a slightly increased risk of eye infection, but they come with six monthly checkups to prevent this. I was wearing the previous generation of lenses (which were noticeably thicker) for about 10 years without serious issue, but with slight irritation around the eyelids caused by the thickness of the lens (and my eyes sometimes getting very dry, because it took a long time for the lens to dry out, so I'd forget to blink sometimes). With the newer ones, it's basically as if I had fully working eyes and if my prescription changes then I can put in different lenses next month.

Comment: Re:Astronomy, and general poor night-time results. (Score 1) 470

by Maxo-Texas (#47529123) Attached to: Laser Eye Surgery, Revisited 10 Years Later

It depends on how bad your vision is.

If it is 20/400 as mine was, after 18 years my vision is still clear tho I'm probably down to 20/40 from 20/20. I don't wear glasses or contacts and haven't since the operation.

I was unable to scuba dive, down hill ski, play racquet ball, and playing ultimate frisbee was impossible when the humidity was high.

When I went to the ocean- I had to leave my glasses on the beach so everything was a blur.

I experimented with disposable contacts and they were fair.

Lasik cost me $500 ($250 per eye) and it took 32 seconds and 39 seconds for my left and right eyes.

If it is dry and I don't drink enough water my eyes will turn fuzzy until I rehydrate. Eyedrops usually fix it instantly but sometimes not.

The surgery gave me a tremendous amount of freedom.

Comment: Re:What about Verizon FIOS? (Score 1) 124

by Martin Blank (#47528633) Attached to: Comcast Carrying 1Tbit/s of IPv6 Internet Traffic

Their status page promised roll-outs starting in late 2012, but it also has horrifically bad information, even for an ISP ("Verizon will use a IPv6/56 address format, which means this will support 56 LANs.") I've asked about it several times, but no one at any level seems to know what's going on. The routers have been IPv6-enabled since spring of 2013, which got a lot of people excited. There's a rumor that the hold-up has to do with newer set-top boxes and broken IPv6 stacks, but no one knows how believable that is. (I don't buy it. I just think Verizon is refusing to spend the money necessary to implement it.)

Comment: Re:Price of using scientists as political pawns (Score 4, Interesting) 197

I agree, we shouldn't be subsidizing the green industries, instead we should just regulate the shit out of the extraction industries which manage to externalize so much of their costs.

How much should the coal industry pay for the ~1M deaths/year?

Comment: Re:wat (Score 2) 182

by Jeremiah Cornelius (#47526131) Attached to: Black Holes Not Black After All, Theorize Physicists

Define a circle.

Do circles exist in reality, or only in mathematical models?

What do engineering artifacts, as approximations of circles, bear in relation to "real" circles?

Are infinities actual, or are they mathematical descriptions for mental extrapolations based in observed phenomena?

Do mathematical models display consistency with real, observable phenomena or with any mental extrapolation? Which one is more "real"? Why?

Mathematics can only describe the set of perceptions, IMHO. When they describe unperceived "realities" they enter the realm of fictions or metaphysics.

Comment: Presbyopia (Score 1) 470

by Ungrounded Lightning (#47525653) Attached to: Laser Eye Surgery, Revisited 10 Years Later

I'm up around retirement age. My eyes don't chage focus much at all. So I have to swap lenses to go from distance to close-up vision. (Yes I could use some kind of bi/tri/progressive-focal lenses. But at the moment swapping is adequate for me.)

Until they find a way to correct presbyopia (and they don't see to be even researching it), I'd still have to don/remove glasses anyhow. With my extreme astigmatism, extreme nearsightedness, and substantial age, I'm not a good candidate for lasic and stand a substantial chance of visual artifacts from it. I'm also a target shooter, so my glasses double as eye protection.

Given all this, the potential benefits for me would be small and the risks and cost oughtweigh them.

But if they ever find a way to fix presbyopia the equation could change substantially.

Computers will not be perfected until they can compute how much more than the estimate the job will cost.